Electrical

3 core & earth (c.2005) to new/current PIR security light wiring

Anonymous user 16/03/2024 - 2.36 PM

Hi there, I have a garage security light which was wired with 3 core & earth around 2005. It's connected to a PIR security light - via a small, external junction box which I think is part of the unit and forms part of the PIR arm. The light is damaged beyond repair and I'd like to replace it but I need to find out which wires connect to which colours. The current set up is: Garage cable: Black, Grey, Earth (bare copper) and Brown Security light: Red, Blue, Yellow/Green and Brown. I bought a new light which only has three cables (Brown, Blue and Yellow) and think have two possible options. 1) Somebody kindly tells me how I connect the new light to the existing junction box, OR 2) I try and wire it to a free-standing waterproof junction box (example link shown below. The challenges are that Option 1 has 4 wires to 3, and Option 2 only allows for 3 to 3 wire connection so what happens to the bare copper earth? If I'm unable to uncouple the existing junction box I may have no option but to purchase a new one. This feels like it should technically be a pretty straightforward job but is proving to be otherwise so I'd be hugely grateful for a bit of help to these questions. Thank you! https://www.amazon.co.uk/Waterproof-Junction-Outdoor-Cable-Connector/dp/B074QGHXJD/ref=pd_sbs_60_1/262-8824716-9585740?_encoding=UTF8&pd_rd_i=B074QGHXJD&pd_rd_r=e83a75f6-cb2e-4540-87f5-7ad4116a7d05&pd_rd_w=vIQyY&pd_rd_wg=ayJyT&pf_rd_p=b9bf232d-9a8a-4c7d-aa9d- 641c0995d3a2&pf_rd_r=16691RSPSGB0HACYJ1WK&psc=1&refRID=16691RSPSGB0HACYJ1WK